Provide an appropriate response.Evaluate the following expression: 
- 
2 + 
A. - 
B. 
C. - 
D. 
Answer: D
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Provide an appropriate response.Add the rational expressions and reduce to simplest terms: 
+ 
A. 
B. 
C. 
D. 
Convert to an expression with a rational exponent.
A. b7
B. b4/3
C. b3/4
D. 
Identify the following fraction as a proper fraction, an improper fraction, or a mixed number.
 figure 1.png)
The rate of change 
of the total number, in thousand of articles, of research articles in the prominent journal Physics Review written by researchers in Europe is shown in the graph, where t is time in years 
represents the start of 1983). Use both left and right Riemann sums with 8 subdivisions
to estimate the total number of articles in Physics Review written by researchers in Europe in the 16-year period beginning 1983. (Estimate each value of 
to the nearest 0.5). Use the sums to obtain an estimate of 
.
? 
?
A. 9,000 articles
B. 50,500 articles
C. 46,000 articles
D. 4,500 articles
E. 55,000 articles